Let-off mechanism for looms



April 26 1927.

CONNECTED To A posrrwi-z LET-OFF 1,626,573 H; A. DAVIS LET-OFF MEGHANISM FOR LOOMS Filed Aug. 17, 1926 ATTORNEY HARRY A. DAVIS, oF HoPEnALn,

Patented Apr. 25, 1927. l

UNITED STATES" .P

TENT oF Fics.. i

MAssAoHUsn'rTs, Assrenon TODRAPER com-'onli- TION, F HOPEDALE, MASSACHUSETTS', A: CORPORATION' OF MANE.

LET-OFF MECHANISM LOOMS.

Application filed August 17, 192e; semi no. 129,571

This invention relates., to' let-od mechanisms for looms and is more particularly directed .to that type of let-oii3 mechanism which is positively controlled to gradually let o-l" the Warp threads as the Weaving progresses, an example of which is found 1n the patent to Northrop, No. 618,363, dated Y January 24, 1899. In this type of let-od n of movement of the tension bar;

ldrawings of one of the `let-oil" mechanism It is desirable at times to varythe tension ofthe spring' because. the tens-ion of the lined bearing 9' through which, in accord-V Warp leading over' the: Whip roll is dependent upon such tension. 'Vh'ifle it is alrela'- tively' easy matter to' ascertain Whether lor not the Warp is subjected to thel desired tension While the loom is' running,t it is difficult to vary the tension of the spring to accommodate the desired tension of the Warp under thesev conditions, and one of the objzectsr of the presentinvention 'is to profvide simple and' effective means for varying the tension ofthe spring and its consequent effect upon the Warp andlet-ott control While the loom is running.

The invention and new combination of parts will. best be madel clear from the following description and the accompanying good form thereof. f In the drawings: Y v Fig. 1 isv perspective- .vi-ew 'of portions provided with the present invention;

Fig. 2 is a section through theA tenslon rod or bar' and Vshowing the detailsv otthe spring tension control; and

3 is' ain enlalgedg sectional view -shovving" more Aparticularly details of the spring tension control. f Y Y The loom frame 1 may be oiY usual vconstruction and' provided withV suitable bearings 2 in which ismounted thexwhi'p roll car-rien, WhichV inthe present instance of the invention comprises the rocker 3 which entends transversely7 of the looin, andVV at its opposite side porti-ons is provided With a ldetermine, the tension ot the Whip roll support 4 having bearings l5- which is mounted the neu-al whiprolrl 6.

Secured to and extending; Y from the rocker 3. is the arm `7 which atV its lonlier end is connected to the tension bar or roc.

herein shown, which are generally known downwardly In positive let-ott mechanisms thetype' as the .Bafitlett-7 -leted mec-hanisin,A the warp. beam has associated. therewith Aa toothed' wheel or ,pinion 8 which: is engaged by a small gear actuated tro-in'- going partl of the loom'bfy u train of lmechanism, such,

for instance, as shown in 'the Tomlinson and ll/luldowney patent, No.V 747,273, dated December 15', 1903, and such train o-'li meehanis-m ,in its amplitu-deof operation onthe warp beam is controlled livthe tensionofl the warp'through thetension: spring...

is an abutment or collar 14 between whichv The loom trame l hasmounted thereon. a

and' the bearing 9.-v is interposed the tensionl spring 15, the varyingl ten-sion of Wl'iichwill Warp passing over ytheV Whip roll'.

Secured toy the tubular tension: rod llOis an 16 located frontvvard of the bearing-9, and to the .arm 16 is; securedthe rod 17?, the

rear end portion `of which passes through the link v18v preferably mountedat 19- upon the loom frame' andzhavingits lower end 18X connected to atraen odi mechanism, such, torinstance, as shown-inthe-,Tomllnson et al. patent, for controlling the'amount of let-oil on thekv Warp` froml the Warpbeam. Since the details od? this train of mechanism torlnno essential part of ther present invention and 7 may be substantially the same as in the Tomlinson et al.. patent, a description thereof is unnecessary. The rod 1.7 passes through. an opening` in the linkl at its upper end and is provided with an adjfustabl'e collar 20', the

effect beingl thatupon tension being exerted on: the-Warp threads a the Whip roll 6 will be moved downwardly against theJ tens-ion off the spring 15, thereby contro-lling. the

amount of let-ofi under control of the tension ofthe warp. The 'rod 17 has a collar 21 between which and the upper endr of the link the latter may 18 is a spring 22. v Y f As hereinbet'ore stated, the tension rod 10 is tubular and is provided with a longitudinally extending opening 23.` Within the tubular tension adjusting rod 24which projects frontwardly beyond the end of thetubular tension rod and is provided with screw threads 25 which are engaged by a wing nut 26,the constructionbeing such that upon manipulation of the wing nut 26 the spring tension adjusting rod 24 may be moved longitudinally within the tubular tension rod 10.

kThe rear end portion of the spring tension adjusting rod 24 is provided with a pin 27 which extends through the longitudinal opening 23 in the tubular tension rod and bears upon' the rearV aceof the abutment or collar 1,4, against thel front face of which rests the tension spring 15, the construction being such that by longitudinal adjustment of the springl tension adjusting rod 24 by means of the wing nut 26, as hereinbefore described, the tension of the spring 15v may benicely and accurately adjusted to the desired tension of the warp.

VVhen'the abutment or collar let` has been moved to possition to impart the desired tension to the spring 15 andconsequently the warpv threads, it may be secured in adj usted position by means of a set screw 28'.

From the construction described, it will be apparent that during the loom operation, the weaver may inspect the tension of the warp threads and bring the tension thereof into proper or desired condition by simple manipulation ot the wing nut 26, and thereafter the positive let-off4 mechanism will be vactuated to let ott the warp from the warp beam under the desired tension.

lNhere the spring tension adjusting rod ,24 is provided with a transversely extending pin 27, as herein shown as a good practical form of the present invention, the Vtubular tension rod 10 may have a slot 23 at each side thereof, as indicated more clearly in Fig. B fior the passage of the pin 27, so that have a Vbearing at diametrically opposite sides of the tension rod upon the-abutment or collar 14.

The invention is not restrictedV to the precise construction and arrangement herein shown and described, nor to the particular 'form ot let-oli mechanism, as changes and modications may be made without departing from the true scope of the real invention as defined by the claims. f

lVhat is'claimed is:

,Claims Y 1. ln a `positive let-oitl mechanism for Y looms, the combination of a rocking whip roll carrier having an arm, and means berod 10 is the spring tension tween said arm and the let-otln'ieohanism for controllingthe rate of let-oli, comprising, a tubular tension' rod-connected thereto, a movable abutment on the tension rod, a tension spring for said tensioni'od, a spring tension adjusting rod within the tubular tension rod having a part ei'igagingthe movable abutment, and means for adjusting the spring tension adjusting rod.

2. ln a positive let-oli mechanism for looms, the combination of a rocking whip rollcarrier having an arm, and means between said arnl and the let-oil mechanism for controlling the rate of let-oit comprising, a tubular tension rod connected thereto, a movable abutment on the tension rod, a tension 'spring for said tension rod, a spring tension adjusting rod Within the tubular tensionrod having a part extending from within the tubular tension rod for engaging the movable abutment, and means for adjusting the spring tension adjusting rod.

S. In a let-off mechanism for looms, the combination of a rocking carrier for the whip roll having an att-ached rocker arm, and means between said arm and the let-oli mechanism for controlling the rate of letoli, comprising, a tubular tension rod connected thereto, a fixed guide through which the rod extends, a movable abutment on the tubular rod, a spring interposed 4between the fixed guide and abutment,.a spring tension adjusting rod within the tubular tension rodv having a part engaging the abutment, and means for adjusting the spring tension adjusting rod within the tubular tension rod to vary the spring tension.y j 4. ln a let-off mechanism Jfor looms, the combination of a whip roll carrier having an arm, and means betweensaid arm and the let-oftl mechanism for controlling the rate of let-oli, compri sing, la tubular tension rod connected to the said arm and having a tension spring, ai collar bearing against the spring, and a spring tension adjusting rod Within the tubular tension rod forradusting the collar to vary the tension of .the spring.V

5. In a let-olin mechanism for looms, the combination of a rocking whip roll carrier, and means between the whip roll carrier and let-oli1 mechanism for controlling the let-oli in accordance with the tensionon the warp,

and means between the Whip roll carrier and let-ofi' mechanism for controlling the rate of let-0H", comprising, a tubular tension rod connected to the Whip 1101i carrier and having a movable collar, u tension spring on the Y movable rod, a Spring tension adjusting rod extending Within the tubular tension rod and having av pin engaging said collar, and means for adjusting the spring tension adjusting rod Within the tubular tension rod to move the collar and vary the spring tension.

7. Inu let-ofi1 mechanismfor looms, the combination of :L rocking whip roll carrier, and means between the Whip roll carrier and let-0H?7 mechanism for controlling the letfoff,

comprising, zt tubular tension rod connected to the Whip roll carrier and having a move ed on the forwardly Vextending end'of the s )rino' tension z1d`usti110' rod for movinv the b D b latter Within theV tension rod to vvary the posit-ion of the collar and adjust the spring tension.

In testimony whereof, I have signed my nume to this specification;

HARRY AY DAVIS.V 

